I think that the answer is letter B.
Answer:
group
Explanation:
The baby ducklings moved in a __group__ behind their mother.
I hope you ace the test!!! :D
1)Endanger
2)Becalm
3)Enjoy
4)Bemoan
5)Besmear
6)Embody
7)Besiege
8)Entrust
9)Bewail
10)Enslave